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WCHS Zoology Chapter 17

tornaria the ciliated larval stage of an acorn worm; class Enteropneusta, phylum Hemichordata
notochord a rodlike, supportive structure that runs along the dorsal midline of all larval chordates and many adult chordates
pharyngeal slits one of several openings in the pharyngeal region of chordates, they allow water to pass from the pharynx to the outside of the body; in the process, water passes over gills or suspended food is removed in a filter-feeding mechanism
tubular nerve cord a hollow nerve cord that runs middorsally along the back of chordates, one of four unique chordated characteristics; also called the neural tube, and in vertebrates, the spinal cord
postanal tail a tail that extends posterior to the anus, one of the four unique characteristics of chordates
endostyle a ciliated tract within the pharynx of some chordates that is used in forming mucus for filter feeding
Created by: dmoudy